Environmental Science
The strongest radiation inversions occur when

Skies are clear
Skies are partly cloudy
Skies are overcast
Precipitation is falling

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Environmental Science
The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?

Low albedo of clouds, low albedo of water
High albedo of clouds, high albedo of water
Low albedo of clouds, high albedo of water
High albedo of clouds, low albedo of water

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

10% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere

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